Uranium-235 releases an average of 2.5 neutrons per fission, while plutonium-239 releases an average of 2.7 neutrons per fission. Which of these elements might you therefore expect to have the smaller critical mass?
A. uranium-235
B. The number of neutrons per fission will not affect the size of critical mass.
C. plutonium-239
D. The critical mass of these elements cannot be determined from only the number of neutrons per fission.
Answer: C
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